Throughout his thirty-plus-year career, Indian-born artist Anish Kapoor has been creating site-specific installations that allow the viewer to touch, walk in, under, and around, and see themselves reflected in the pieces’ surfaces. He most often works with shiny mirrorlike materials (Chicago’s “Cloud Gate,” New York City’s “Sky Mirror”) and red PVC (England’s “Taratantara”), incorporating concave and convex shapes that play with physical and psychological space while inviting visitors in. But his latest massive construction, commissioned by the Guggenheim as part of the museum’s fiftieth anniversary celebration, shuts people out. “Memory,” a twenty-four-ton sculpture consisting of 154 eight-millimeter-thick Cor-Ten steel tiles and first displayed by the Deutsche Guggenheim in late 2008, presents what the London-based Turner Prize-winning artist calls a “confrontational dichotomy.”

The sculpture is first encountered at the end of a long, narrow entrance to one of the museum’s annex galleries, where it blocks people from entering a space that is usually wide open and welcoming. Instead, here it offers tantalizing glimpses of what lies beyond. The piece can next be seen in another annex gallery that appears to contain only a dark painting in an otherwise all-white room. In actuality, the dark rectangle has been cut out of the wall and leads inside the sculpture, but again Kapoor has denied access; you can look in — it will take a few minutes for your eyes to adjust — but you cannot enter what could be the piece’s brain. Finally, at the third and final viewing location, the bulk of the work threatens to overwhelm you, its huge, rusty mass trapping you in front, with no way to get around it. At times it appears to be a giant bullet, or maybe even a breast, coming straight at you.

“Memory” is a fascinating conundrum, unable to be seen in its entirety, challenging museumgoers to contemplate both its inside and outside, as if reaching into their own memory system. Manufactured by Centraalstaal B.V., the enormous sculpture was engineered by Brighton-based Aerotrope Limited. The founder and director of Aerotrope, Christopher Hornzee-Jones, who has worked with Kapoor for many years, recently took part in an exclusive twi-ny talk to discuss what went on behind the scenes of “Memory.”

twi-ny: What was the single hardest part of physically getting “Memory” into the Guggenheim?

CH-J: Anish Kapoor had a very clear idea of how he wanted this sculpture to be: The form of “Memory” had to be such that it would skim the walls and ceiling, effectively filling a whole room and touching its walls. It was our job to find a way of breaking down 24 tonnes of sculpture into 154 pieces, which could travel up to the gallery room via a relatively small elevator. Next, all these pieces of steel had to be fitted neatly together with lots of bolts. Imagine a very thin guy, lying with his arms outstretched on top of the sculpture, in the narrow space left below the ceiling. Armed with just a spanner, this skinny worker would tighten bolts in all the hard-to-reach spaces, until the sculpture finally stood up.

For me as a structural engineer it was also an unusual challenge to resolve its structure in such a way that “Memory” would be able to fit tightly into two very different spaces: Deutsche Guggenheim Berlin and the Guggenheim in New York. This was probably the hardest part. In New York, the team put their trust in our company’s ability to “do the maths right” so that this massive sculpture would be able to rest on just a single floor beam, without any extra support. Now that “Memory” is installed successfully I can say that I have fulfilled a personal dream, to work with the famous Guggenheim Foundation. They even asked me to write an essay for the exhibition catalogue. I felt very honoured.

You also worked with Anish Kapoor on Chicago's “Cloud Gate.” How is it to work with him? Is he a stern taskmaster, a playful collaborator (given the type of sculptures he makes), or somewhere in between?

There is no doubt that Anish Kapoor is very demanding, and rightfully so. He has a clear artistic vision, but he is also willing to listen to the engineer’s point of view. Anish has a good feeling for what is possible, and then he goes and pushes those limits of possibility. His work often takes us engineers into new territory and out of what has been done before. But this is where the fun starts. I think Anish knows that we don’t like saying that “something cannot be done,” and as an artist he appreciates this attitude.

You can see in the variety of his work that Kapoor is very playful. But he is also very serious. When we meet, the starting point is a model or a sketch. The meetings are often short but intense, and then each party goes away and works on their part: The artist refines his idea, we refine the engineering, and then we reconvene to compare notes. Over the years we have developed a shared language between us that quickly helps us understand each other’s views. Sometimes it’s tough to find the right solution, but being on the same wavelength as Kapoor helps us ride out any stressful phases of the project.

Yes, definitely! It comes from a love of the kind of forms Kapoor often works with, a love for bold organic shapes. Personally, I am drawn to these because I like forms shaped by nature and the elements. As an engineer I work with objects like yacht hulls, aircraft wings, and wind turbine blades. For me these types of shapes, beyond their industrial functionality, bear an intrinsic aesthetic quality. Kapoor’s art is very powerful in that it challenges how you see things; it questions how you perceive your surroundings and yourself within it. When I saw “Memory” installed for the first time, it was a great moment. All the tools were packed away, the space clean and ready for the opening. I sat down with my back leaning against the same wall that the sculpture’s enormous mass was leaning against. At that moment I definitely felt a great sense of connection with the work.